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1. 发明公开

EP0233786A2 Circuit for providing a controlled resistance 失效
标题翻译： Schaltung zur Schaffung eines gesteuerten Widerstands。
公开(公告)号：EP0233786A2
公开(公告)日：1987-08-26
申请号：EP87301455.9
申请日：1987-02-19
申请人： HAVEN AUTOMATION LIMITED
发明人： Evans, William Alun , Rowlands, Stuart Lee
IPC分类号： G06G7/62
CPC分类号： G01K15/00 , G06G7/62
摘要： A circuit for providing a controlled resistance, the apparatus comprising a pair of terminals for input of an excitation current, variable resistance means connected in the current path between the terminals, means for deriving a first signal representing the value of the voltage appearing across the terminals, means for deriving a second signal representing the value of the excitation current, means for generating a third signal representing a selected value of resistance to be provided between the pair of terminals, means for comparing the ratio of the first and second signals with the value of the third signal to derive a difference signal, and means for applying the difference signal to cause the variable resistance means to change in value such that said ratio tends towards exact equality with the selected value of resistance.
摘要翻译：一种用于提供受控电阻的电路，该电路包括用于输入激励电流的一对端子，连接在端子之间的电流通路中的可变电阻装置，用于导出表示跨过端子的电压值的第一信号的装置用于产生代表激励电流值的第二信号的装置，用于产生代表在所述一对终端之间提供的电阻的选定值的第三信号的装置，用于将第一和第二信号的比率与值的第三信号以导出差分信号;以及用于施加差分信号以使可变电阻装置改变值的装置，使得所述比率与所选择的电阻值趋向于精确相等。

2. 发明公开

EP0233786A3 Circuit for providing a controlled resistance 失效
标题翻译：提供控制电阻的电路
公开(公告)号：EP0233786A3
公开(公告)日：1990-04-25
申请号：EP87301455.9
申请日：1987-02-19
申请人： HAVEN AUTOMATION LIMITED
发明人： Evans, William Alun , Rowlands, Stuart Lee
IPC分类号： G06G7/62
CPC分类号： G01K15/00 , G06G7/62
摘要： A circuit for providing a controlled resistance, the apparatus comprising a pair of terminals for input of an excitation current, variable resistance means connected in the current path between the terminals, means for deriving a first signal representing the value of the voltage appearing across the terminals, means for deriving a second signal representing the value of the excitation current, means for generating a third signal representing a selected value of resistance to be provided between the pair of terminals, means for comparing the ratio of the first and second signals with the value of the third signal to derive a difference signal, and means for applying the difference signal to cause the variable resistance means to change in value such that said ratio tends towards exact equality with the selected value of resistance.
摘要翻译：一种用于提供受控电阻的电路，该电路包括用于输入激励电流的一对端子，连接在端子之间的电流通路中的可变电阻装置，用于导出表示跨过端子的电压值的第一信号的装置用于产生代表激励电流值的第二信号的装置，用于产生代表在所述一对终端之间提供的电阻的选定值的第三信号的装置，用于将第一和第二信号的比率与值的第三信号以导出差分信号;以及用于施加差分信号以使可变电阻装置改变值的装置，使得所述比率与所选择的电阻值趋向于精确相等。

3. 发明授权

US4728881A Circuit for providing a controlled resistance 失效
标题翻译：提供受控电阻的电路
公开(公告)号：US4728881A
公开(公告)日：1988-03-01
申请号：US16286
申请日：1987-02-19
申请人： William A. Evans , Stuart L. Rowlands
发明人： William A. Evans , Stuart L. Rowlands
IPC分类号： G01K15/00 , G06G7/62 , G01R27/02
CPC分类号： G01K15/00 , G06G7/62
摘要： A circuit for providing a controlled resistance, the circuit comprising a pair of terminals for input of an excitation current, variable resistance means connected in the current path between the terminals, means for deriving a first signal representing the value of the voltage appearing across the terminals, means for deriving a second signal representing the value of the excitation current, means for generating a third signal representing a selected value of resistance to be provided between the pair of terminals, means for comparing the ratio of the first and second signals with the value of the third signal to derive a difference signal, and means for applying the difference signal to cause the variable resistance means to change in value such that said ratio tends towards exact equality with the selected value of resistance.
摘要翻译：一种用于提供受控电阻的电路，所述电路包括用于输入激励电流的一对端子，连接在端子之间的电流通路中的可变电阻装置，用于导出表示跨过端子的电压值的第一信号的装置用于产生代表激励电流值的第二信号的装置，用于产生代表在一对终端之间提供的电阻的选定值的第三信号的装置，用于将第一和第二信号的比率与值以产生差分信号，以及用于施加差分信号以使可变电阻装置改变值的装置，使得所述比率与所选择的电阻值趋于精确相等。

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